1221321113131 has 16 divisors (see below), whose sum is σ = 1406891780608. Its totient is φ = 1038556209600.

The previous prime is 1221321113099. The next prime is 1221321113143. The reversal of 1221321113131 is 1313111231221.

It is not a de Polignac number, because 1221321113131 - 2⁵ = 1221321113099 is a prime.

It is a super-2 number, since 2×1221321113131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221321113171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 858615 + ... + 1783216.

It is an arithmetic number, because the mean of its divisors is an integer number (87930736288).

Almost surely, 2^{1221321113131} is an apocalyptic number.

1221321113131 is a deficient number, since it is larger than the sum of its proper divisors (185570667477).

1221321113131 is a wasteful number, since it uses less digits than its factorization.

1221321113131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2642362.

The product of its digits is 216, while the sum is 22.

Adding to 1221321113131 its reverse (1313111231221), we get a palindrome (2534432344352).

The spelling of 1221321113131 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-one million, one hundred thirteen thousand, one hundred thirty-one".